But since then, the euro has appreciated nearly 11% as its member countries battled to contain sovereign debt crises, rising unemployment and social unrest. The euro now stands at a 13-month high against the greenback.

And flying in the face of last year's critics, former European Central Bank chief Jean-Claude Trichet told CNN's Nina dos Santos that the euro "was never about to collapse" and that its viability as a currency is solid.

"The euro as a currency has never been put in question," asserted Trichet, while at the same time admitting the euro area's financial stability and credit worthiness had been tested.

"We believe major central banks should focus on enhancing their cooperation...to guide market expectations and thus help avoid a disorderly interest rate adjustment process and undue exchange rate volatility," the Institute of International Finance wrote in a letter to Russian Finance Minister Anton Siluanov, who is chairing the G20 finance minister's meeting later this week.